mario and luigi and peach and daisy

Has the 4GB card been formatted with the FAT32 filesystem in your computer? The D100 supports FAT32, so greater-than-2GB memory cards should not be a problem in theory. :confused:

BTW, I've not yet heard of viruses getting on memory cards and affecting digital cameras, yet. I'm sure the day will come, as digital cameras become more powerful and [perhaps] start using more general purpose processing units.